The present study was conducted to investigate the biochemical and cultural characteristics of Escherichia coli isolates from clinically affected chickens during the period from May 1988 to June 1989. A total of 82 E coli cultures were isolated from lesions of 75 chickens with colisepticemia.
Biochemical properties of E coli isolates tested were in accordance with the general classification standard; all the isolates showed positive reaction in Catalase, Indol, and Methyl-Red tests, but negative reaction in Oxidase, Urease, Yoges-Proskauer, Citrate utility, H₂S, Phenylalanine diaminase, and malonate tests. And the carbohydrate fermentation rates of them were shown to be variable.
Of the 82 isolates, 48(58.5%) cultures produced colicin to inhibit the indicator strain of E coli.
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